CN108252821B

CN108252821B - Combined metal elastic sealing structure for spray pipe adjusting plate and casing

Info

Publication number: CN108252821B
Application number: CN201711427474.4A
Authority: CN
Inventors: 王恒; 廖华琳; 马钊; 李晓明; 胡金龙; 罗红飞; 任亚强; 杨亚雄
Original assignee: AECC Sichuan Gas Turbine Research Institute
Current assignee: AECC Sichuan Gas Turbine Research Institute
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2020-04-07
Anticipated expiration: 2037-12-26
Also published as: CN108252821A

Abstract

The invention relates to a combined metal elastic sealing structure for a spray pipe adjusting plate and a casing; the structure includes: a first sealing sheet; the second sealing piece, the hook, the support frame, the first bolt, the pin shaft and the second bolt; the second sealing sheet, the hook and the support frame are fixedly arranged on a rear flange of the round-to-square casing through a first bolt; the second gasket passes through second bolt fixed mounting at the round square machine casket that changes, and first gasket is connected with the couple through the round pin axle, and first gasket can rotate around the round pin axle, and the couple on the support frame passes the square hole on the first gasket and the back contact of first gasket, supports first gasket. The structure provided by the invention isolates high-temperature gas and cooling air flow, prevents gas leakage, ensures the working efficiency of the engine, does not influence the effectiveness of the sealing structure due to the rotation of the rotating part, and prolongs the service life of parts.

Description

Combined metal elastic sealing structure for spray pipe adjusting plate and casing

Technical Field

The invention relates to a combined metal elastic sealing structure for sealing an adjusting plate and a casing on a binary adjustable nozzle.

Background

With the continuous development of aviation technology, the demand of advanced engines on a binary adjustable nozzle is increasingly urgent, and the problem to be solved for realizing the engineering application is sealing.

In the binary adjustable nozzle, because the adjusting plate needs to rotate around the circular-to-square-section casing in structural design, a larger gap exists between the front edge of the adjusting plate and the tail ends of the circular-to-square-section casing and the heat shield. As can be seen from fig. 1, the cooling structure design requires that the flow paths of the cooling air flow are: and the airflow hole penetrates through the circular-to-square casing from a cavity formed by the circular-to-square casing and the heat shield and enters a cooling cavity in the adjusting plate. However, due to the existence of the gap, the cooling air flow may directly enter the nozzle pipe from the gap as shown by the dotted line in fig. 1 to be mixed with the high-temperature gas, so that the utilization efficiency of the cooling air is reduced, and even the high-temperature gas may flow into the internal structure from the gap, so that the structure is failed, and huge loss is caused. The sealing function is to isolate high-temperature gas and cooling air flow, prevent leakage and ensure efficient utilization of engine air flow.

When the advanced aviation turbofan engine is used for applying force, the working temperature of an exhaust system reaches about 2050K, and the rubber ring seal commonly used in the civil field cannot bear the high temperature at all. Due to the difference of working conditions, the sealing technology on components or systems such as a fan, a gas compressor, a turbine, a mechanical system and the like in the aircraft engine cannot be directly applied to sealing of an adjusting plate and a casing on the binary spray pipe, and the sealing design of the binary adjustable spray pipe is basically blank at home.

Disclosure of Invention

Object of the Invention

In order to seal a larger gap between a circular rotating square casing and an adjusting plate under a high-temperature condition, a combined metal elastic sealing structure for a spray pipe adjusting plate and the casing is provided.

Technical scheme

The design idea of the invention is to adopt high temperature resistant elastic metal as sealing material, so that the metal is pre-compressed to a certain extent during installation, and the contact surface is pressed to a certain extent, and through proper structural design, the seamless sealing contact surface is ensured when the adjusting sheet rotates.

The invention designs a combined metal elastic sealing structure, as shown in figure 2, comprising: a first seal piece (1); a second seal piece (2); a hook (3); a support frame (4); a first bolt (5); a pin (6); a second bolt (7);

the combined metal elastic sealing structure is fixedly arranged on a rear flange of a round-square casing through bolts, wherein a second sealing sheet (2) is arranged through a first bolt (5) and a second bolt (7); the hook (3) and the support frame (4) are installed through a first bolt (5); first gasket (1) is connected with couple (3) through round pin axle (6), consequently first gasket (1) can rotate around round pin axle (6), and the square hole that the tooth passed on first gasket (1) on support frame (4) and the back contact of first gasket (1) support first gasket (1).

The invention distributes the deformation amount required by a single part to the first sealing sheet (1), the second sealing sheet (2) and the support frame (4).

Advantageous technical effects

The combined metal elastic sealing structure designed for the adjusting sheet and the casing can achieve the following technical effects:

a) the combined metal elastic sealing structure designed by the invention can isolate high-temperature gas and cooling air flow, prevent gas leakage and ensure the working efficiency of an engine;

b) the combined metal elastic sealing structure designed by the invention can be used for sealing a fixed part and a rotating part, and the rotating part does not influence the effectiveness of the sealing structure;

c) the combined metal elastic sealing structure designed by the invention adopts the high-temperature resistant metal sheet, is suitable for sealing high-temperature fluid, and reduces the risk of sealing failure;

d) the combined metal elastic sealing structure designed by the invention reduces the deformation of single parts and prolongs the service life of the parts.

Drawings

FIG. 1 is a schematic diagram of the position of the exhaust device requiring sealing

FIG. 2 is a schematic view of a sealing structure according to the present invention

FIG. 3 is a view showing the installation relationship among the first sealing piece, the hook and the supporting frame

FIG. 4 is a schematic view of the installation of the sealing structure of the present invention

FIG. 5 is a schematic view of the seal after the adjustment plate rotates 30 °;

description of numbering: 1-a first sealing sheet; 2-a second sealing sheet; 3-hooking; 4-a support frame; 5-a first bolt; 6-a pin shaft; 7-second bolt.

Detailed Description

The sealing structure shown in fig. 2 is installed at the slit position shown in fig. 1, and the installation schematic is shown in fig. 4.

In the invention, the heat shield and the casing are fixedly connected through the arch frame. The adjusting plate is hinged with a mounting seat on the casing through a pin shaft, high-temperature gas flows on the inner side of the heat shield, cooling air flows in a cavity formed by the heat shield and the casing, the cooling air flows into a cooling channel of the adjusting plate through an air flow hole on the casing, and the heat shield and the adjusting plate cannot be in direct transition to ensure that the cooling air flows do not leak into the mainstream high-temperature gas due to the fact that the adjusting plate can rotate around the hinge, and therefore a transition region between the adjusting plate and the heat shield needs to be sealed through a sealing structure.

In the invention, the sealing is realized by a combined sealing structure consisting of a first sealing sheet (1), a second sealing sheet (2), a hook (3) and a support frame (4), wherein the first sealing sheet (1), the second sealing sheet (2) and the support frame (4) are elastic metal sheets with small thickness, and the thickness is about 0.5 mm. After the combined sealing structure is installed, the heat shield is in contact with the second sealing piece (2), the adjusting plate is in contact with the first sealing piece (1), and the first sealing piece (1) is in contact with the second sealing piece (2). The distance from the contact point on the heat shield to the contact point on the adjusting plate is smaller than the distance between the corresponding contact points on the first sealing sheet (1) and the second sealing sheet (2) in a free state, so that the combined metal elastic sealing structure is ensured to generate certain elastic deformation under the action of a pre-tightening force in an installation state, and the sealing of the cooling channel and the main flow channel is ensured.

Inside the combined metal elastic sealing structure, the second sealing sheet (2) is installed on a rear flange of the circular-to-square casing through a first bolt (5) and a second bolt (7), is in direct contact with the heat shield and the first sealing sheet (1), and has pretightening force interaction. First gasket (1) is articulated through round pin axle (6) and couple (3), and the back contact of quad slit on first gasket (1) and first gasket (1) is passed to the tooth of hanging on support frame (4) simultaneously, supports first gasket (1), and regulating plate and second gasket (2) are to the pretightning force of first gasket (1), and support frame (4) are to first gasket (1) holding power use round pin axle (6) as the balance of fulcrum formation power and moment on first gasket (1). The support frame (4) is installed on the circular-rotating square-section rear flange through a first bolt (5) and is subjected to the reaction force of the first sealing sheet (1). Therefore, under the installation state of the combined sealing device, the interaction force in the sealing device enables the first sealing sheet (1), the second sealing sheet (2) and the support frame (4) to deform together, the deformation of single parts is reduced, and the service life of the parts is prolonged.

According to the invention, the adjusting plate can rotate around the hinge, and the surface of the front end of the adjusting plate, which is in contact with the first sealing piece (1), is an arc surface, so that the action point and the action direction of the adjusting plate on applying pressure to the first sealing piece (1) can not be changed. Because the effect of elastic force, the regulating plate is at the rotation in-process, and terminal surface keeps in close contact all the time before first gasket (2) and heat screen, first gasket (1) and second gasket (2), first gasket (1) and the regulating plate, has guaranteed sealed effect.

According to the working state of the engine, including the temperature and pressure conditions of main stream gas and cooling gas, the plate thickness of the first sealing sheet (1), the second sealing sheet (2) and the support frame (4) can be properly adjusted, so that the parts always have certain pretightening force and elastic deformation under the gas condition, and the sealing failure caused by the problems of plastic deformation or breakage and the like can be avoided under the high-temperature action.

Claims

1. A combined metal elastic sealing structure for a nozzle adjusting plate and a casing comprises a first sealing sheet (1); a second seal piece (2); a hook (3); a support frame (4); a first bolt (5); a pin (6); a second bolt (7); the method is characterized in that: the second sealing piece (2), the hook (3) and the support frame (4) are fixedly arranged on a rear flange of the round-to-square casing through a first bolt (5); second gasket (2) are through second bolt (7) fixed mounting at the round square of changeing quick-witted casket, and first gasket (1) is connected with couple (3) through round pin axle (6), and first gasket (1) can rotate around round pin axle (6), and square hole on first gasket (1) is passed in couple (3) on support frame (4) and the back contact of first gasket (1), supports first gasket (1).

2. The seal structure of claim 1, wherein: the first sealing sheet (1), the second sealing sheet (2) and the supporting frame (4) are elastic metal sheets with thin thickness.